Redshift controversy

Learn about this topic in these articles:

work of Arp

…was known as the “redshift controversy.” The controversy faded away in the late 1970s and early 1980s when Arp’s theory could not account for quasars and nearby galaxies that were at the same redshift, the gravitational lensing of quasars by high-redshift galaxies, or the existence of high-redshift intergalactic gas…